| Autor: |
Chen, Qiu, Luo, Pan, Liao, Li, Shen, Yin, Luo, Xiaoshuang, Li, Xinpeng, Wen, Xuanzhong, Song, Jialin, Yu, Bo, Chen, Junchen, Guo, Bingshu, Wang, Mingshan, Huang, Yun, Liu, Fuliang, Liu, Jiangtao, Li, Zhedong, Ma, Jingrun, Wang, Shuiyong, Li, Xing |
| Předmět: |
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| Zdroj: |
Batteries & Supercaps; Nov2024, Vol. 7 Issue 11, p1-8, 8p |
| Abstrakt: |
Electrolyte design is the optimal strategy to achieve extremely low temperature operation of lithium‐ion batteries. Here, the diffusion coefficient of Li+ is proposed to improve the ion transport kinetics at low temperatures. The diffusion coefficient of Li+ is improved by constructing a Li+ solvation sheath with weak steric effects. Specifically, high binding energy BF4− anions are added to a 1 M LiPF6 in propyl acetate (PA) electrolyte. Since the binding energy of Li+ with BF4− is greater than that of PA. Therefore, the small‐sized BF4− replaces the large‐sized PA molecule to form a Li+ solvation sheath with a weak steric effect, which increases the diffusion coefficient of Li+. Using the high diffusion coefficient electrolyte, the 800 mAh pouch cell retain 91 % and 75 % of its room temperature capacity at −40 °C(0.5 C rate) and −60 °C (0.2 C rate), respectively. And it also shows stable cycling at −40 °C. This work provides a new strategy for designing low‐temperature electrolytes of lithium‐ion batteries. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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